Nigdy nie subskrybowałem planu Adobe Stock, a jest na moim koncie od kilku miesięcy

Contact Adobe customer service to cancel that, if you did not use the subscription.

Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled, you need to accept cookies! If the chat window fails to open, or is non-responsive, use a different device and/or browser to start the interaction.

For support via Twitter:
https://twitter.com/AdobeCare

(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)

Important: Adobe does NOT contact you unsolicited by e-mail or direct message. If you get contacted by direct message from a person, claiming to be an Adobe employee, look at that profile and check if they bear the “Adobe Employee” marking under their name. Adobe support does not use Skype to give you support.
If in doubt, ask the forum.

You DID subscribe, possibly by agreeing to a free 30 day trial subscription, which converts to an annual plan if you didn't cancel within 30 days. Adobe does not sign up subscribers without their express consent.

Cancellation instructions are shown here, although at this point you'll probably incur cancellation charges.

https://helpx.adobe.com/stock/kb/cancel-membership-subscription-stock.html